Calculate the mass in grams of 3.00 moles of carbon Select one: 120g 18 g 6g 36g

Question

Calculate the mass in grams of 3.00 moles of carbon Select one: 120g 18 g 6g 36g none of above How many motes is 64 grams of sulfur? Select one: 2 3 1 32 none of above Which of the following is not equal to 1 mote of substance? Select one: 6.02 Times 10^23 hydrogen molecules, H_2 6.02 Times 10^23 sodium molecules, Na 6.02 Times 10^23 gold atoms, Au 22.4 L of H2 gas at STP one atom of carbon What is the mass percentage of carbon in caffeine, C_4H_5N_2O? Select one: 97.11% 49% 12% 36% none of above

Explanation / Answer

1)

molar mass of Carbon = 12 g/mol

number of moles = 3

mass = number of moles * molar mass

= 3*12

= 36 g

Answer: d

2)

Molar mass of S = 32 g/mol

mass = 64 g

number of moles = mass/molar mass

= 64/32

= 2 mol

Answer: a

3)

Answer: e

4)

molar mass of caffeine = 4*12 + 5*1 + 2*14 + 16 = 97 g/mol

mass of C = 4*12 = 48 g

mass % = 48*100/97

= 49%

Answer: b

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